Broadband Spontaneous and Stimulated Luminescence of Heavily Doped AlxGa1 – xN Structures

Abstract

The spectral characteristics of spontaneous and stimulated luminescence of heavily silicon-doped Al_xGa_{1 – x}N structures with the concentration n_Si > 1020 cm^–3 are studied with pulsed optical pumping at λ = 266 nm. The resulting dominant broadband radiation with a full width at half maximum of ~150 nm covers the whole visible spectral region. The radiation spectrum from the end of the structure is split into narrow components determined by the mode structure of the planar waveguide formed. The results indicate the stimulated character of the radiation. The optical gain for different structures fall in the range 20–70 cm^–1.